ENERGY LOSSES IN FUEL INJECTOR

New demands regarding reducing emissions of pollutants from motor vehicles in road transport lead to requests for continual improvement of technical solutions of the IC engine on one hand, as well as using of alternative fuels on the other. Application of alternative fuels in IC diesel engines could be different and it makes a conclusion based on necessity of well knowing fuel characteristics and its influences on injection characteristics. Based on analysis of different used alternative fuels, it has been noticed that basic parameters of fuel injection process, like injection pressure, injection duration, fuel injected amount, etc. were changed, influencing combustion process in the IC diesel engine. According to these facts, in order to make an optimal combustion process in the IC diesel engine, it is necessary to set up fuel injection system. A special part of fuel injection system is the injector, where transformation from potential to kinematic energy of fuel is conducted, with significant energy losses. Therefore special attention was dedicated to processing experimental results, first of all to shape the injection rate, as well as other mentioned injection characteristics. After analysis, a definition of energy losses in the injector was done and presented in the paper.